I had researched along those lines but if that was the case then these techniques would be documented in the FCTM but I cannot find anything along those lines.
From the depths of my memory JAA needed autoland distances multiplied by 115% of certified landing distance (not sure if FAA requires this). Is this correct? Maybe the OPT figures cannot be less than the 115% so they are artificially increased?
Just looked up an old Airbus document "Getting to grips with AC performance". It seems JAA (JAR AWO - now CS AWO?) used to require autoland distances to be increased by 3 x std dev of some of the airborne portion (end of g/s to touchdown) and also by 3 x std dev of ground roll. So the above 115% may not be correct.
Last edited by LH777; 15th Nov 2017 at 08:38.